Leucanthemum plant named ‘Spoonful of Sugar’

ABSTRACT

The new Shasta daisy plant,  Leucanthemum  ‘Spoonful of Sugar’, is a sturdy upright mound with dark-green serrated foliage with large, free-flowering, creamy-white inflorescences just above the foliage that cover the plant nearly from the soil to the top with numerous inflorescences on short, heavily-branched stems. The new plant is useful in the landscape as a long-flowering border, in mass, as accent plants and containerized for patio or indoor use, or as a cut flower.

Botanical classification: Leucanthemum×superbum (L. Burbank).

Variety denomination: ‘Spoonful of Sugar’.

BACKGROUND OF THE INVENTION

The original Leucanthemum×superbum, or Shasta daisies, were bred by Luther Burbank in the late 1800's as a cross between Leucanthemum maximum (Ramond) D.C. with Leucanthemum lacustre (Broth.) Samp. The new plant, Leucanthemum ‘Spoonful of Sugar’ originated from a planned breeding program of the inventor at a wholesale perennial nursery in Zeeland, Mich., USA in the summer of 2011. The new Leucanthemum was a single selected seedling from a pollination of an unreleased proprietary female parent identified as K9-31-02 (not patented) and the male parent was the unreleased proprietary hybrid K9-25-01 (unpatented). The new plant was originally evaluated in the summer of 2013 and assigned the breeder number 11-03-xx. The present invention relates to a new and distinct cultivar of Shasta daisy botanically known as Leucanthemum×superbum and hereinafter referred to by the cultivar name ‘Spoonful of Sugar’.

Asexual reproduction of the new cultivar by basal shoot cuttings and sterile shoot-tip tissue culture at the same nursery in Zeeland, Mich. as early as the summer of 2013 has demonstrated that the new cultivar reproduces true to type with all of the characteristics of the original plant retained through successive generations of asexual propagation.

BRIEF SUMMARY OF THE INVENTION

The new plant, Leucanthemum ‘Spoonful of Sugar’, is most closely compared to the Leucanthemum ‘Snowcap’ (not patented) in habit, Leucanthemum ‘Real Galaxy’ U.S. Plant Pat. No. 23,873 in inflorescence color, and ‘Whoops-a-Daisy’ U.S. Plant Pat. No. 27,259 in free-flowering. In test trials in Zeeland, Mich. Leucanthemum ‘Spoonful of Sugar’ had a compact, short, dense, dome-like, rounded habit in flower. ‘Spoonful of Sugar’ also has broad, flat, creamy-white flower heads of two rows of ray flowers. Compared with ‘Snowcap’ (not patented) the new Shasta daisy has broader flower heads, and the ray florets are more creamy white and not as pure white. Compared with ‘Whoops-a-Daisy’ the new plant has slightly larger inflorescences and the ray florets are more creamy white. Compared with ‘Sonnenschein’ (not patented) the new plant is shorter with more compact flowering and the ray florets more creamy white and less yellow. Compared with ‘Real Galaxy’ the new plant is considerably shorter and more compact and the ray florets are not as fringed and thin. Comparisons to the parents are not possible as neither parent still exists.

Leucanthemum ‘Spoonful of Sugar’ differs from all cultivars known to the inventor in the following combined traits:

-   -   1. Sturdy plants with dark-green serrated foliage and strongly         branched stems.     -   2. Low, mounded habit with large inflorescences covering just         above the foliage from the top of the plant to the ground.     -   3. Flowering with numerous axillary heads on branched stems.     -   4. Double row of wide ray florets of creamy white.     -   5. Freely flowering, not requiring vernalization period for         flower initiation.

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

The photographs of the new plant demonstrate the overall appearance and landscape qualities of the new plant, including the unique traits. The colors are as accurate as reasonably possible with color reproductions. Ambient light spectrum, source, direction and temperature may cause the appearance of minor variation in color. The drawings are of a two-year-old plant grown in a full-sun trial garden in Zeeland, Mich.

FIG. 1 Shows the new plant at peak flowering from above with inflorescences covering the plant from nearly top to ground.

FIG. 2 Shows a side view of the new plant in early stages of flowering.

DETAILED BOTANICAL DESCRIPTION

The following descriptions and color references are based on the 2001 edition of The Royal Horticultural Society Colour Chart except where common dictionary terms are used. The new plant has not been observed in all possible environments and conditions. The phenotype of Leucanthemum ‘Spoonful of Sugar’ may vary with different growing conditions such as changes in temperature, light intensity, water availability, fertility, but without change in the genotype.

The plants used for description purposes were two-year-old plants and were grown in Zeeland, Mich. in a full-sun, loamy-sand trial plot environment with supplemental water and limited fertilizer as needed. Summer temperatures range from night lows of about 10° C. to daytime highs of about 34° C. Measurements and numerical values represent averages of trial plants.

-   Botanical classification: Leucanthemum ×superbum (L. Burbank). -   Parentage: Female parent unreleased proprietary seedling K9-31-02     (not patented); male parent the unreleased proprietary hybrid     K9-25-01 (not patented). -   Habit: Herbaceous perennial with about 35 branched stems arising     from rhizome base; each stem having about three to four     inflorescences, rarely two; about 35.0 cm tall and 60.0 cm across     with rounded top and sides; flowering from top to nearly soil level. -   Roots: Fibrous, thin, heavily branched; root color nearest RHS 155D     depending on soil type. -   Propagation: tip cuttings or tissue culture; about two weeks to     produce roots from cutting; about 33 weeks to finish to flower in     3.8 liter pot depending on season. -   Stems: About eighty main stems per plant, strong, upright and     angled, 7.0 mm diameter at base, 30.0 cm tall; canaliculated,     hispidulous; about 15 nodes, average internode length about 2.0 cm. -   Stem color: Between RHS 139B and RHS 137B. -   Axillary branches: Three to four, rarely two per main stem; between     6 to 10 cm long and 4 mm diameter; less canaliculated than main     stem, sparsely hispidulous; at angles of about 30° from vertical     main stem. -   Axillary branch color: Between RHS 139B and RHS 137B. -   Leaves: Lanceolate; apex acute; base sessile to attenuate, partially     clasping; glabrous above, glabrous below except for main veins     sparsely hispidulous, serrate with about 16 to 20 teeth per side in     lowest leaves and 8 teeth in most distal leaves, more closely     arranged in distal portion of leaf; teeth about 1.0 mm long; lowest     leaves about 8.0 cm long and about 12.0 mm wide, distal leaves about     5.0 cm long and about 1.0 cm wide, average about 6.5 cm long and     about 1.1 cm wide. -   Leaf color: Adaxial color nearest RHS 137A, abaxial color between     RHS 137A and RHS 137B; no fragrance detected. -   Veins: Major secondary veins anastomosing, glabrous; adaxial     slightly recessed. -   Vein color: Abaxial midrib nearest RHS 144A and secondary veins     nearest RHS 138A toward base becoming same as surrounding leaf     tissue in proximal half; adaxial midrib between RHS N144A and RHS     144A, secondary veins nearest RHS 138B on adaxial side. -   Inflorescence: Capitate, about 120 per plant; primary inflorescence     about 10.0 cm across and about 1.5 cm tall, axillary inflorescences     8.5 cm across and 1.2 cm tall; comprising about 96 ray florets and     about 800 disc florets; individual inflorescence lasting about two     weeks on or cut from plant. -   Fragrance: Slightly musty with age. -   Flowering period: Early summer to late summer in Michigan; for about     four weeks with initial flowering and followed up immediately with     another three weeks. -   Peduncle: Strong, sparsely hispidulous; slightly canaliculated at     base, more intense canaliculated just below inflorescence; about 5.0     cm to 7.5 cm long and 2.0 to 3.0 mm diameter at base above foliage. -   Peduncle color: Nearest RHS 137C. -   Bud: With ray florets still vertical, adaxial and abaxial ray     florets about 2.5 cm tall and about 2.0 cm across; color between RHS     155D and RHS 158D. -   Ray florets: Arranged around perimeter of capitulum in at least two     overlapping rows; to about 3.7 cm long and 10.0 mm wide; lanceolate;     glabrous abaxial and adaxial; acute apex doubly emarginate,     producing center lobe about 1.0 mm long and 2.0 mm wide at base, and     two others on either side about 1.0 mm long and 1.2 mm wide at base;     base attenuate, margin entire; to about 3.7 cm long and 10.0 mm     wide. -   Ray floret color: Are first at 180° horizontal adaxial slightly     lighter than RHS 155D and abaxial lighter than RHS 155D; mature     adaxial nearest RHS 155B and abaxial lighter than RHS 155D; base     10.0 mm on adaxial side and 12.0 mm on abaxial side nearest RHS     145B. -   Disc florets: Combined about 2.6 cm across and about 1.5 cm tall;     individual floret about 8.0 mm tall and 1.2 mm wide, five pointed,     about 3.0 mm long with acute apex, fused at base. -   Disc floret color: Base between RHS 146 C and RHS 146B; apical 3 mm     of RHS 13A. -   Androecium: Only in disc florets; five stamens connate around style.     -   -   Anther.—About 2.0 mm long and less than one mm wide, anther             coloration nearest RHS 17A.         -   Filaments.—Fused together at base, about 2.0 mm long and             less than 0.1 mm diameter, filament coloration nearest RHS             2D. -   Gynoecium: In ray florets and disc florets.     -   -   Style.—About 5.0 mm long and about 0.5 mm diameter, split             and curved at apical 1.0 mm; color nearest RHS 154D.         -   Stigma.—Less than 0.5 mm diameter; color between RHS 17D and             RHS 17C. -   Involucre: Made of about three layers of phyllaries averaging 48 per     head; to 3.0 across and 0.5 cm tall. -   Phyllaries: Glabrous; entire margin, apex acute, base truncate; 10.0     mm long and 3.0 mm wide. -   Phyllaries color: Nearest RHS 145A on abaxial and adaxial center     portions and between RHS 144A and RHS 144B in the crosswise center     portions and base; distal phyllaries with a 1.0 mm wide margin in     the apical 3.0 mm or nearest RHS 166A. -   Fruit: Achene, pointed at base and rounded at distal end with     longitudinal color striations nearest RHS N200A and lighter than RHS     155D; about 3 to 4 mm long and 1.5 mm across.

Leucanthemum ‘Spoonful of Sugar’ grows best with adequate moisture but can tolerate some dryness once established. It is tolerant of high temperatures of at least 36° and cold hardy to at least USDA zone 5 as well as strong wind and rain. Other disease or pest resistance beyond that common to Shasta daisy has not been observed. 

It is claimed:
 1. A new and distinct Leucanthemum plant named ‘Spoonful of Sugar’ as herein illustrated and described. 